27 d
In a perfectly controlled laboratory environment, a pure-breeding fish with a 23-mm tail was crossed to a
pure-breeding fish with a 15-mm tail. In the F1, all individuals had tails of an intermediate length: 19 mm.
If tail length is a typical polygenic trait controlled entirely by the equal and additive effect of two
unlinked genes, each with two alleles ("+" and "-"), what phenotypic ratios do you expect to find in the
F2?
out of
question
1
A
B
1